timer.hpp

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#ifndef VIENNASHE_UTIL_TIMER_HPP
#define VIENNASHE_UTIL_TIMER_HPP
/* ============================================================================
   Copyright (c) 2011-2022, Institute for Microelectronics,
                            Institute for Analysis and Scientific Computing,
                            TU Wien.
 
                            -----------------
     ViennaSHE - The Vienna Spherical Harmonics Expansion Boltzmann Solver
                            -----------------
 
                    http://viennashe.sourceforge.net/
 
   License:         MIT (X11), see file LICENSE in the base directory
=============================================================================== */
 
#include <iostream>
 
#ifdef _WIN32
 
  #include <windows.h>
  #undef min
  #undef max
 
#else
 
  #include <sys/time.h>
 
#endif
 
namespace viennashe
{
  namespace util
  {
 
#ifdef _WIN32 // WINDOWS
 
 
    class timer
    {
    public:
 
      timer()  { QueryPerformanceFrequency(&freq_); }
 
      void start()
      {
        QueryPerformanceCounter((LARGE_INTEGER*) &start_time_);
      }
 
      double get() const
      {
        LARGE_INTEGER  end_time;
        QueryPerformanceCounter((LARGE_INTEGER*) &end_time);
        return (static_cast<double>(end_time.QuadPart) - static_cast<double>(start_time_.QuadPart)) / static_cast<double>(freq_.QuadPart);
      }
 
    private:
      LARGE_INTEGER freq_;
      LARGE_INTEGER start_time_;
    };
 
#else // NOT WINDOWS
 
    class timer
    {
    public:
 
      timer() : ts_(0) { }
 
      void start()
      {
        struct timeval tval;
        gettimeofday(&tval, 0);
        ts_ = tval.tv_sec * 1000000 + tval.tv_usec;
      }
 
      double get() const
      {
        struct timeval tval;
        gettimeofday(&tval, 0);
 
        long end_time = tval.tv_sec * 1000000 + tval.tv_usec;
 
        return static_cast<double>(end_time - ts_) / 1000000.0;
      }
 
    private:
      long ts_;
    };
 
 
#endif
 
  } // namespace util
} //  namespace viennashe
 
#endif